SMR No.: ME019-030001-

Monument Type: Megalithic Art

1 of 43 orthostats on the right side of the east megalithic passage tomb chamber at Knowth, Brú na Bóinne. The orthostat is decorated with three large interlinked concentric circles and a series of large and small chevrons.


Front elevation view of decorated orthostat 39, Knowth east passage Perspective view 1 of decorated orthostat 39, Knowth east passage Perspective view 2 of decorated orthostat 39, Knowth east passage


Note: Orthostat has been rotataed onto side by 90° to ensure maximum rendering size

3D Model


Technical Details

3D Capture Method: Close range Scanning

3D Capture Description: The Artec EVA scanner is used to generate high resolution models of surfaces with small scale detail. The Artec EVA uses structured light to record. A forensics tent is used to create a controlled lighting environment and ensure measurement can proceed regardless of the weather when used outdoors. Scanning is undertaken with the fastest speed setting (15 frames per second) and with a minimum 400 mm depth of field. The data is recorded with sufficient overlap between scans to ensure easy registration.

  • Resolution 0.5 mm
  • Accuracy 0.1 mm
  • Accuracy over distance 0.03% over 100 cm
  • Texture Resolution 1.3 mp
  • Colours 24 bpp
  • Light Source flash bulb (no laser)
  • Video frame rate 16 fps Exposure time 0.0002 s

Post-processing is done in Artec Studio 9 software: individual scans are edited, aligned, before a final surface is generated using global registration, fusion, and a small objects filter algorithm. If required, a textured surface can also be created. The model is exported from Artec Studio 9 as an .obj file. For dissemination purposes a 3D pdf of the model is generated using Geomagic Studio 2012.

Data Processing Software: Artec Studio 9 & Geomagic Studio


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Arts Heritage and the Gaeltacht